A water resistance safety device used on a combustible gas pipeline

Abstract

The present invention discloses a water resistance safety device for use on a combustible gas pipeline, comprising a device housing consisting of an outer tank and an inner tank. An annular air duct is provided between the outer tank and the inner tank, and a water filter is provided in the middle of the inner tank. The water filter divides the inner tank into a lower water resistance chamber and an upper gas storage chamber, wherein water is provided in the water resistance chamber. An air inlet interface is provided at the lower end of the device housing, an air outlet interface is provided at the upper end, and an explosion-proof interface is provided on the top surface. The air inlet interface, the air outlet interface, and the explosion-proof interface are all composed of inner and outer pipes. A circulating air duct is formed between the inner and outer pipes; the inner pipes of the air outlet interface and the explosion-proof interface are both connected to the gas storage chamber, the inner pipe of the air inlet interface is connected to the lower end of the water resistance chamber, and a one-way valve is installed in the inner pipe of the air inlet interface; an explosion-proof valve is provided on the explosion-proof interface. The present invention can effectively prevent backfire explosion flames or pressure waves from flowing back along the pipeline, and effectively release the energy generated by the explosion or pressure wave, thereby protecting the engine, pipelines, and other components.

Description

Technical Field

[0001] The present invention relates to the technical field of explosion-proof safety devices, in particular to a water resistance safety device applied to a combustible gas pipeline. Background Art

[0002] Currently, in the engine industry, the government is vigorously promoting the development of combustible gas (natural gas, hydrogen, and ammonia) fuels for gasoline and diesel engines. The goal is to reduce harmful emissions from the internal combustion engine industry, protect our atmosphere, and mitigate the greenhouse gas effect. Most marine engines use diesel engines, and the government is actively promoting the use of combustible gas engines instead. Due to the high risk of combustible gas explosions, strict safety measures are in place for the storage, pipeline transportation, and engine combustion of combustible gas onboard ships. Figure 1 This is a simplified diagram of the conventional supply of combustible gas for ship engines. As shown, it includes a gas tank A1, a double-layer pipeline A2, and a GVU box A3. The GVU box A3 further integrates valve components such as a filter, a pressure regulating valve, and a quick-disconnect valve. The gas tank A1 is required to be placed on an open deck, away from cargo. The double-layer pipeline A2 consists of an outer tube nestled within an inner tube, with a ventilation duct formed between the outer and inner tubes. The inner tube of the double-layer pipeline A2 transports the combustible gas. The ventilation duct provides ventilation and prevents combustible gas leakage and accumulation. Before entering the engine, the combustible gas must be filtered and depressurized before combustion. In the event of an accident, should combustible gas ignite or explode in the engine or pipeline, the quick-disconnect valve in the GVU box, upon detecting a signal, will rapidly shut off the gas supply, preventing internal explosion flames or pressure surges from flowing back up the pipeline into the gas tank 1 and causing a larger explosion or damage. This requires more comprehensive and reliable safety measures. However, if the quick-break stop valve fails and cannot be closed or is not closed tightly or leaks air, the danger will still exist. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the current state of the above-mentioned prior art and provide a water-blocking safety device for use in combustible gas pipelines. This water-blocking safety device, installed in a double-layer pipeline, effectively prevents backfire explosion flames or pressure waves from flowing back along the pipeline, controls the flames or pressure waves at the front end, and effectively releases the energy generated by the explosion or pressure wave, thereby protecting components such as the engine and pipelines.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A water resistance safety device applied to a combustible gas pipeline comprises a device shell with a cylindrical structure, the device shell is composed of an outer tank and an inner tank arranged in the outer tank, and an annular air duct for circulating air is provided between the outer tank and the inner tank; a water filter for filtering out moisture contained in the combustible gas is provided in the middle of the inner tank, and the water filter divides the inner tank into a lower water resistance chamber and an upper gas storage chamber, and water is provided in the water resistance chamber for preventing the combustible gas of the air inlet interface from directly intersecting with the combustible gas of the gas storage chamber; the air inlet interface is radially provided at the lower end of the device shell, and the air outlet interface is radially provided at the upper end of the device shell. An explosion-proof interface is longitudinally arranged on the top surface of the outer shell; the air inlet interface, air outlet interface and explosion-proof interface are all composed of an outer pipe and an inner pipe arranged in the outer pipe; a circulating air duct connected to the annular air duct is formed between the outer pipe and the inner pipe; the inner pipes of the air outlet interface and the explosion-proof interface are both connected to the gas storage chamber of the inner tank, and the inner pipe of the air inlet interface is connected to the lower end of the water resistance chamber of the inner tank, and a one-way valve that only allows combustible gas to enter the water resistance chamber is installed in the inner pipe of the air inlet interface; an explosion-proof valve is installed on the explosion-proof interface, which can quickly release the energy that flows back into the gas storage chamber in the event of an explosion.

[0006] To optimize the above technical solutions, specific measures taken also include:

[0007] The above-mentioned air inlet interface and air outlet interface are arranged 180 degrees apart in the circumferential direction on the device housing; the air inlet interface, air outlet interface and explosion-proof interface are all equipped with connecting flanges for easy connection and installation.

[0008] A water level window for displaying the water level in the water resistance chamber is longitudinally provided on the circumference of the inner tank, and a transparent observation window for convenient water level observation is provided on the circumference of the outer tank at the position corresponding to the water level window.

[0009] A water injection pipe is installed on the housing of the above-mentioned device and radially penetrates into the air storage chamber for replenishing water for the water resistance chamber. An electromagnetic water control valve is installed on the water injection pipe.

[0010] The above-mentioned one-way valve consists of a valve body, a valve core and a return spring; the valve body is fixedly installed on the inner layer connecting pipe, and a valve cavity is formed axially through the valve body, and the valve core is slidably arranged in the valve cavity of the valve body. The front end of the valve core cooperates with the sealing cone surface at the front end of the valve cavity to form a one-way valve port for preventing the backflow of combustible gas, and the rear end of the return spring presses on the step surface at the rear end of the valve cavity, and the front end of the return spring is in contact with the valve core; the valve core is formed with an air intake guide hole for guiding the combustible gas flowing through the one-way valve port into the water resistance chamber, and the air intake guide hole is composed of an axial guide hole and a radial guide hole formed on the valve core.

[0011] The explosion-proof valve is welded or fixed to the connection flange of the explosion-proof interface by bolts, and a flange sealing ring is press-fitted between the connection flange and the explosion-proof valve to prevent the leakage of combustible gas.

[0012] The above-mentioned explosion-proof valve is assembled by a mounting flange, an upper flange, a flame arrester, a sealing cylinder, a sealing cover and a small pressure spring; the flame arrester is pressed between the mounting flange and the upper flange through a bolt assembly; the sealing cylinder is fixedly installed in the center hole formed in the upper flange; the sealing cover and the sealing cylinder are slidably fitted up and down, and the sealing cover and the sealing cylinder are sealed to form an air pressure balance chamber, in which a small pressure spring is arranged, the upper end of the small pressure spring is connected to the sealing cylinder, and the lower end of the small pressure spring is connected to the bottom plate of the sealing cover.

[0013] An explosion-proof valve port is formed in the center of the above-mentioned mounting flange, and the explosion-proof valve port is connected to the gas storage chamber of the inner tank through the inner layer pipe of the explosion-proof interface; the flame arrester is annular, and a pressure relief zone is formed between the outer peripheral surface of the sealing cover and the flame arrester, and the pressure relief zone is connected to the outside atmosphere through the flame arrester; the bottom plate of the sealing cover cooperates with the explosion-proof valve port seal to form a throat for controlling the connection between the gas storage chamber and the pressure relief zone, and a pressure balance hole is opened in the center of the bottom plate of the sealing cover for connecting the pressure balance cavity with the gas storage chamber.

[0014] The explosion-proof valve port on the above-mentioned mounting flange is equipped with a valve port sealing ring for improving the throat sealing performance. A plurality of air guide grooves are longitudinally processed on the outer peripheral surface of the sealing cover. The air guide grooves are used to communicate the air pressure balance chamber and the pressure relief area after the sealing cover moves upward a certain distance.

[0015] The sealing cylinder has a large cylindrical inner wall and a small cylindrical inner wall formed in the cylinder cavity. The diameter of the large cylindrical inner wall is larger than the diameter of the small cylindrical inner wall. A small sealing ring is installed on the outer peripheral surface of the upper end of the sealing cover to cooperate with the small cylindrical inner wall in sealing.

[0016] Compared to the prior art, the water resistance safety device of the present invention includes a device housing composed of an inner tank and an outer tank. A water filter is installed in the inner tank, dividing the inner tank into a lower water resistance chamber and an upper gas storage chamber. Water is contained in the water resistance chamber, which acts as a barrier, preventing the combustible gas in the gas storage chamber from intersecting with the combustible gas at the intake port. Thus, if an engine explosion occurs, the flaming combustible gas flows back into the gas storage chamber. The water barrier prevents the combustible gas in the gas storage chamber from further igniting the combustible gas at the intake port. The device housing of the present invention also includes an explosion-proof valve, which quickly releases the high-temperature, high-pressure energy generated by the explosion to prevent secondary explosions. A one-way valve is also installed in the intake port of the device housing. This one-way valve quickly closes under the pressure exerted by the explosion on the water surface, cutting off the combustible gas supply. This prevents the energy wave generated by the explosion from being transmitted through the pipeline to other equipment supplying the combustible gas, thereby ensuring the safety of the entire combustible gas supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a simplified diagram of the supply of combustible gas for ship engines in the prior art;

[0018] Figure 2 It is a structural schematic diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the state in which the one-way valve of the present invention is closed and the explosion-proof valve is opened when an explosion occurs;

[0020] Figure 4 It is a structural schematic diagram of the explosion-proof valve of the present invention;

[0021] Figure 5 This is a schematic diagram of the explosion-proof valve of the present invention when the throat is open when the pressure rises instantly (explodes);

[0022] Figure 6 This is a schematic diagram of the explosion-proof valve of the present invention when the pressure is fully released;

[0023] Figure 7 It is a structural schematic diagram of the sealing cylinder of the present invention;

[0024] Figure 8 It is a structural schematic diagram of the sealing cover of the present invention;

[0025] Figure 9 yes Figure 8 Schematic diagram of the cross-section structure of the middle sealing cover;

[0026] Figure 10 It is a structural schematic diagram of the one-way valve of the present invention;

[0027] Figure 11 This is a simplified diagram of the application of the present invention in the supply of combustible gas to an engine.

[0028] The accompanying drawings are marked as follows: gas storage tank A1, double-layer pipeline A2, GVU box A3, connecting flange F, flange sealing ring F1, outer pipe G1, inner pipe G2, circulating air duct H, small sealing ring M, air pressure balance chamber Q, water S, water injection pipe W, electromagnetic water valve W1, pressure relief area X, device shell 1, outer tank 11, inner tank 12, water resistance chamber 12a, gas storage chamber 12b, annular air duct 13, water filter 2, air inlet interface 3, air outlet interface 4, explosion-proof interface 5, one-way valve 6 , one-way valve port 6a, valve body 61, sealing cone 61a, valve core 62, axial guide hole 62a, radial guide hole 62b, return spring 63, explosion-proof valve 7, mounting flange 71, explosion-proof valve port 71a, upper flange 72, flame arrester 73, sealing tube 74, large cylindrical inner wall 741, small cylindrical inner wall 742, sealing cover 75, air pressure balance hole 75a, air guide groove 75b, small pressure spring 76, bolt assembly 77, valve port sealing ring 78, water level window 8, observation window 9. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0030] Figure 1 This is a simplified diagram of the supply of combustible gas for ship engines in the prior art. As shown in the figure, it includes a gas tank A1 for storing combustible gas, a gas supply pipeline, and a GVU box A3. The gas supply pipeline is a double-layer pipeline A2 consisting of an inner pipe and an outer pipe, wherein the inner pipe is used to transport combustible gas, and the outer pipe is used for circulation and ventilation. The GVU box A3 is integrated with valve components such as filters, pressure regulating valves, and quick-break stop valves to ensure the safety of the combustible gas supply. Figure 1 As shown by the arrows in the figure, combustible gas is supplied from an external supply device to the gas storage tank A1 for storage and use in the combustion device. Taking the engine as an example, during the engine combustion process, the combustible gas enters the GVU box A3 through the double-layer pipeline A2, is filtered and depressurized, and then is supplied to the engine through the double-layer pipeline A2. In the event of an unexpected engine explosion, the quick-break shut-off valve installed in the GVU box will quickly cut off the supply channel of the combustible gas after detecting the high-pressure energy signal generated by the explosion, preventing the explosion flame or pressure wave inside the pipeline from flowing back along the pipeline into the gas storage tank A1 and causing a larger explosion or damage. However, if the quick-break shut-off valve of this design structure fails in the combustible gas pipeline supply system, fails to close, or closes loosely, or leaks, the danger will still exist.

[0031] like Figures 2 to 10 As shown, the present invention discloses a water resistance safety device applied to a combustible gas pipeline, such as Figure 11As shown, the water resistance safety device can be installed in the double-layer pipeline A2 that supplies gas from the GVU box A3 to the engine, and the combustible gas passes through the water resistance safety device before going to the engine. The present invention can effectively prevent the backfire explosion flame or pressure wave from flowing back along the pipeline, control the flame or pressure wave at the front end, and effectively release the energy generated by the explosion or pressure wave, thereby protecting the engine and pipeline components. The water resistance safety device of the present invention includes a device shell 1 with a cylindrical double-layer structure, and the device shell 1 is composed of an outer tank 11 and an inner tank 12 arranged in the outer tank 11. An annular air duct 13 for circulating air to pass through is formed between the outer tank 11 and the inner tank 12. A water filter 2 is provided in the middle of the inner cavity of the inner tank 12. The water filter 2 is used to filter out the moisture contained in the combustible gas to ensure that the supplied gas is clean. The water filter 2 divides the inner cavity of the inner tank 12 into a lower water resistance chamber 12a and an upper air storage chamber 12b. The lower end of the device housing 1 is radially provided with an air inlet port 3. Combustible gas can enter the water resistance chamber 12a through the air inlet port 3 and then pass through the water filter 2 into the gas storage chamber 12b. Water S is provided in the water resistance chamber 12a to act as a water barrier. The water S prevents the combustible gas at the air inlet port 3 from directly intersecting with the combustible gas entering the gas storage chamber 12b. In other words, the presence of water prevents the combustible gas at the air inlet port 3 from intersecting with the combustible gas in the gas storage chamber 12b. Therefore, if the engine explodes, the explosion flame or pressure wave flows back into the gas storage chamber and ignites the combustible gas in the gas storage chamber 12b. However, due to the barrier of water S in the water resistance chamber 12a, the combustible gas in the gas storage chamber 12b cannot continue to ignite the combustible gas at the air inlet port. The upper end of the device housing 1 is radially provided with an air outlet port 4. Combustible gas entering the gas storage chamber 12b can then be transported to the engine through the air outlet port 4. The top surface of the device housing 1 is also longitudinally provided with an explosion-proof port 5. The air inlet interface 3, the air outlet interface 4 and the explosion-proof interface 5 of the present invention are also double-layer tube structures. Figure 2 and Figure 3 As can be seen, each is composed of an outer pipe G1 and an inner pipe G2 disposed within the outer pipe G1. A circulating air duct H, connected to the annular air duct 13, is formed between the outer pipe G1 and the inner pipe G2. The circulating air duct H can be connected to the air duct of the double-layer pipeline A2, preventing leaked combustible gas from accumulating in the pipeline through circulating ventilation. The inner pipes G2 of the outlet port 4 and the explosion-proof port 5 are both connected to the gas storage chamber 12b of the inner tank 12, while the inner pipe G2 of the inlet port 3 is connected to the lower end of the water resistance chamber 12a of the inner tank 12. To prevent the energy wave from the explosion from continuing along the pipeline after an explosion, a one-way valve 6 is installed in the inner pipe G2 of the inlet port 3 of the present invention. The one-way valve 6 only allows one-way flow of combustible gas into the water resistance chamber 12a. The explosion-proof port 5 of the present invention is equipped with an explosion-proof valve 7 that can quickly release energy that has backflowed into the gas storage chamber 12b in the event of an explosion.

[0032] In the embodiment Figure 1and Figure 2 As shown, the air inlet port 3 and air outlet port 4 of the present invention are arranged 180 degrees apart circumferentially on the device housing 1. Each of the air inlet port 3, air outlet port 4, and explosion-proof port 5 is equipped with a connecting flange F for convenient connection and installation. The connecting flange F facilitates the installation of the explosion-proof valve 7 and the water resistance safety device in the double-layer pipeline A2.

[0033] In order to facilitate the observation of the water level in the device, the present invention also provides a water level window 8 for displaying the water level in the water resistance chamber 12a longitudinally on the circumference of the inner tank 12, and a transparent observation window 9 for convenient observation of the water level window 8 is provided on the circumference of the outer tank 11 at the corresponding water level window 8.

[0034] In the embodiment, the housing 1 of the device of the present invention is equipped with a water injection pipe W that radially penetrates into the air storage chamber 12b and is used to replenish water in the water resistance chamber 12a. The water injection pipe W is equipped with an electromagnetic water control valve W1. When the water level is observed to be too low, water can be replenished in the water resistance chamber 12a by opening the electromagnetic water control valve W1. The present invention is preferably provided with a water level monitoring sensor in the water resistance chamber 12a, so that the water level in the water resistance chamber 12a can be monitored in real time by using the water level monitoring sensor. The water level monitoring sensor is connected to a controller. When the water level falls below the monitoring lower limit set by the water level monitoring sensor, the water level monitoring sensor can feed back an electrical signal to the controller, which then controls the electromagnetic water control valve W1 to open and replenish water in the water resistance chamber 12a. When the water level reaches the monitoring upper limit set by the water level monitoring sensor, the water level monitoring sensor again feeds back an electrical signal to the controller, which then controls the electromagnetic water control valve W1 to close.

[0035] In the embodiment Figure 10 As shown, the one-way valve 6 of the present invention comprises a valve body 61, a valve core 62, and a return spring 63. The valve body 61 is fixedly mounted on the inner pipe G2. A valve cavity is formed axially through the valve body 61. The valve core 62 is slidably disposed in the valve cavity of the valve body 61. The front end of the valve core 62 seals with the sealing cone 61a at the front end of the valve cavity to form a one-way valve port 6a for preventing the backflow of combustible gas. The rear end of the return spring 63 presses against the stepped surface at the rear end of the valve cavity, and the front end of the return spring 63 contacts the valve core 62. The valve core 62 is formed with an air intake guide hole for guiding the combustible gas flowing through the one-way valve port 6a into the water resistance chamber 12a. The air intake guide hole is composed of an axial guide hole 62a and a radial guide hole 62b formed in the valve core 62.

[0036] In the embodiment Figure 4 As shown, the explosion-proof valve 7 of the present invention is welded or fixedly mounted on the connection flange F of the explosion-proof interface 5 by bolts, and a flange sealing ring F1 is press-fitted between the connection flange F and the explosion-proof valve 7 to prevent the leakage of combustible gas.

[0037] like Figures 4 to 6As shown, the explosion-proof valve 7 of the present invention is an explosion-proof valve with an air pressure balance chamber pressure relief structure. The explosion-proof valve is sensitive to reaction. It uses the pressure difference of the force-bearing surface and the size of the force-bearing area to create a difference in the force size between the inner side and the outer side. A small pressure spring with very small pressure can ensure the sealing performance of the explosion-proof valve, so that no matter how large the pressure in the inner tank 12 is, as long as the pressure rises rapidly (explosion), the explosion-proof valve can be opened completely and in time to release the pressure quickly and completely.

[0038] As can be seen from the figure, the explosion-proof valve 7 is assembled from a mounting flange 71, an upper flange 72, a flame arrester 73, a sealing cylinder 74, a sealing cover 75, and a small pressure spring 76. The flame arrester 73 is annular and is coaxially pressed between the mounting flange 71 and the upper flange 72 via a bolt assembly 77. The mounting flange 71 is welded or bolted to the connecting flange F of the explosion-proof interface 5. The bolt assembly 77 consists of a screw welded to the mounting flange 71 and a nut that screws with the screw. The flame arrester 73 is composed of multiple flame arrester plates, which extinguish fire and flames. The flame and pressure wave generated by the explosion pass through the flame arrester 73, and the flame is extinguished before being released into the atmosphere. The sealing cylinder 74 is fixedly mounted in the center hole formed in the upper flange 72. The sealing cover 75 and the sealing cylinder 74 slide together up and down, and the sealing cover 75 and the sealing cylinder 74 are sealed to form an air pressure balance chamber Q. A small pressure spring 76 is arranged in the air pressure balance chamber Q. The upper end of the small pressure spring 76 is connected to the sealing cylinder 74, and the lower end of the small pressure spring 76 is connected to the bottom plate of the sealing cover 75.

[0039] An explosion-proof valve port 71a is formed in the center of the mounting flange 71. This port communicates with the gas storage chamber 12b of the inner tank 12 via the inner pipe G2 of the explosion-proof interface 5. A pressure relief zone X is formed between the outer circumference of the sealing cover 75 and the flame arrester 73. This pressure relief zone X communicates with the outside atmosphere via the flame arrester 73. The bottom plate of the sealing cover 75 seals with the explosion-proof valve port 71a, forming a throat for controlling the connection between the gas storage chamber 12b and the pressure relief zone X. A pressure balancing hole 75a is formed in the center of the bottom plate of the sealing cover 75, connecting the pressure balancing chamber Q with the gas storage chamber 12b. This pressure balancing hole 75a is a damping hole with a relatively small diameter.

[0040] The pressure balance cavity Q can be connected to the air storage chamber 12b through the pressure balance hole 75a to exchange gas (pressure). Figure 4As shown, the diameter D2 of the inner stress-bearing surface of the sealing cover 75 is slightly larger than the diameter D1 of the outer stress-bearing surface of the sealing cover 75. Thus, under the same pressure, the force acting on the inner surface of the sealing cover 75 is greater than the force acting on the outer surface of the sealing cover 75, causing the sealing cover 75 to press downward and seal the explosion-proof valve port 71a. Based on this, a small pressure spring can be installed in the air pressure balance chamber Q of the present invention to utilize the pressure difference caused by the difference in stress-bearing area. In combination with the small pressure spring, the sealing cover 75 can be pushed downward to cooperate with the sealing and pressing of the explosion-proof valve port 71a. The bottom plate of the sealing cover 75 cooperates with the explosion-proof valve port 71a to form a throat for controlling the connection between the air storage chamber 12b and the pressure relief zone X, preventing the air storage chamber 12b from communicating with the pressure relief zone X under normal circumstances.

[0041] In the embodiment, the explosion-proof valve port 71a on the mounting flange 71 of the present invention is equipped with a valve port sealing ring 78 for improving the sealing performance of the throat port. Figure 8 and Figure 9 As shown, the outer circumference of the sealing cover 75 of the present invention is further longitudinally processed with a plurality of air guide grooves 75b, which are used to connect the air pressure balance chamber Q and the pressure relief area X after the sealing cover 75 moves upward a certain distance.

[0042] like Figure 5 As shown, when an explosion occurs, the pressure in the air storage chamber 12b will rise rapidly. At this time, the force acting on the outer side (i.e., the lower side) of the sealing cover 75 will also rise suddenly. Since the air pressure balance hole 75a is a damping air hole, the pressure in the air pressure balance chamber Q rises slowly and significantly lags behind, resulting in a serious imbalance between the air pressure in the air pressure balance chamber Q and the air pressure in the air storage chamber 12b. As a result, the pressure outside the sealing cover 75 is much greater than the pressure inside the sealing cover 75. The sealing cover 75 is pushed upward to open the throat, allowing the air storage chamber 12b to communicate with the pressure relief area X for pressure relief. At the same time, the upward movement of the sealing cover 75 also connects the air pressure balance chamber Q with the pressure relief area X through the air guide groove 75b, so that the pressure in the air pressure balance chamber Q is released to be consistent with the external atmospheric pressure, so that the sealing cover 75 will Figure 6 As shown, it is fully opened, and the pressure generated by the explosion is released quickly and completely.

[0043] like Figure 7 As shown, the sealing cylinder 74 of the present invention has a large cylindrical inner wall 741 and a small cylindrical inner wall 742 formed in the cylinder cavity. The diameter of the large cylindrical inner wall 741 is larger than the diameter of the small cylindrical inner wall 742. A small sealing ring M is mounted on the outer circumferential surface of the upper end of the sealing cover 75 for sealingly cooperating with the small cylindrical inner wall 742.

[0044] The application principle of the present invention is as follows:

[0045] like Figure 11As shown, when the engine backfires or explodes in extreme circumstances, the flames from the explosion backfire inside the pipeline flow back along the double-layer pipeline A2, reaching the gas storage chamber 12b of the inner tank 12, igniting the combustible gas in the gas storage chamber 12b and causing another explosion. The gas pressure generated by the explosion opens the explosion-proof valve 7 at the top of the inner tank 12, releasing the pressure generated by the explosion, and the explosion flames are completely extinguished through the explosion-proof valve 7. Simultaneously, the pressure generated by the explosion acts on the water surface in the water resistance chamber 12a of the inner tank 12, causing the water in the water resistance chamber 12a to flow back along the inner pipe G2 of the air inlet port 3. The backflowing water exerts a pressure opposite to that of the combustible gas at the check valve 6, forcing the check valve 6 to close. The combustible gas is then blocked at the check valve 6 and cannot enter the inner tank 12 to continue burning and exploding. After the first explosion of the inner tank 12, the combustible gas explosion pressure and flames are released. Since there is no further combustible gas to replenish, a second explosion cannot occur, and the flames are extinguished within the inner tank 12, preventing them from flowing back.

[0046] In some extreme cases, for example, when the one-way valve 6 of the water resistance safety device fails, the valve core becomes stuck, leaks and cannot be closed, the pressure generated by the explosion of the combustible gas in the inner tank 12 will push the water below into the one-way valve 6 that cannot be closed. The water will flow back along the double-layer pipeline A2 instead of the flame. The water can completely isolate the flame from the combustible gas, thereby achieving the purpose of safety.

[0047] The present invention is also applicable to civilian combustible gas pipelines, such as natural gas pipelines used in factories and households.

[0048] The best embodiment of the present invention has been described, and various changes or modifications can be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. A water resistance safety device for use on a combustible gas pipeline, comprising a device housing (1) having a cylindrical structure, characterized in that: The device shell (1) is composed of an outer tank (11) and an inner tank (12) arranged in the outer tank (11), and an annular air duct (13) for circulating air to pass through is provided between the outer tank (11) and the inner tank (12); a water filter (2) for filtering out moisture contained in the combustible gas is provided in the middle of the inner tank (12), and the water filter (2) divides the inner tank (12) into a lower water resistance chamber (12a) and an upper gas storage chamber (12b), and the water resistance chamber (12a) is provided with water (S) for blocking the direct intersection of the combustible gas of the air inlet interface (3) and the combustible gas of the gas storage chamber (12b); the air inlet interface (3) is radially provided at the lower end of the device shell (1), the upper end of the device shell (1) is radially provided with an air outlet interface (4), and the top surface of the device shell (1) is longitudinally provided with an explosion-proof interface (5); the air inlet interface (3) is radially provided at the lower end of the device shell (1), and the upper end of the device shell (1) is radially provided with an air outlet interface (4). The port (3), the air outlet interface (4) and the explosion-proof interface (5) are all composed of an outer pipe (G1) and an inner pipe (G2) arranged in the outer pipe (G1); a circulating air duct (H) connected to the annular air duct (13) is formed between the outer pipe (G1) and the inner pipe (G2); the inner pipe (G2) of the air outlet interface (4) and the explosion-proof interface (5) are both connected to the gas storage chamber (12b) of the inner tank (12); the inner pipe (G2) of the air inlet interface (3) is connected to the lower end of the water resistance chamber (12a) of the inner tank (12), and a one-way valve (6) is installed in the inner pipe (G2) of the air inlet interface (3) for allowing only combustible gas to enter the water resistance chamber (12a); and the explosion-proof interface (5) is installed with an explosion-proof valve (7) that can quickly release the energy flowing back into the gas storage chamber (12b) when encountering an explosion.

2. A water resistance safety device for use on a combustible gas pipeline according to claim 1, characterized in that: The air inlet interface (3) and the air outlet interface (4) are arranged 180 degrees apart in the circumferential direction on the device housing (1); the air inlet interface (3), the air outlet interface (4) and the explosion-proof interface (5) are all equipped with a connecting flange (F) for convenient connection and installation.

3. A water resistance safety device for use on a combustible gas pipeline according to claim 2, characterized in that: A water level window (8) for displaying the water level in the water resistance chamber (12a) is longitudinally provided on the circumference of the inner tank (12), and a transparent observation window (9) for conveniently observing the water level is provided on the circumference of the outer tank (11) at a position corresponding to the water level window (8).

4. The water resistance safety device for use on a combustible gas pipeline according to claim 3, characterized in that: The device housing (1) is provided with a water injection pipe (W) radially penetrating into the air storage chamber (12b) for replenishing water to the water resistance chamber (12a), and an electromagnetically controlled water valve (W1) is provided on the water injection pipe (W).

5. The water resistance safety device for use on a combustible gas pipeline according to claim 4, characterized in that: The one-way valve (6) is composed of a valve body (61), a valve core (62) and a return spring (63); the valve body (61) is fixedly mounted on the inner pipe (G2), and a valve cavity is formed axially through the valve body (61); the valve core (62) is slidably arranged in the valve cavity of the valve body (61); the front end of the valve core (62) is sealed with the sealing cone surface (61a) at the front end of the valve cavity to form a one-way valve port (6a) for preventing the backflow of combustible gas; the rear end of the return spring (63) is pressed against the step surface at the rear end of the valve cavity, and the front end of the return spring (63) is in contact with the valve core (62); the valve core (62) is formed with an air intake guide hole for guiding the combustible gas flowing through the one-way valve port (6a) into the water resistance chamber (12a); the air intake guide hole is composed of an axial guide hole (62a) and a radial guide hole (62b) formed on the valve core (62).

6. The water resistance safety device for use on a combustible gas pipeline according to claim 5, characterized in that: The explosion-proof valve (7) is welded or fixedly mounted on the connection flange (F) of the explosion-proof interface (5) by bolts, and a flange sealing ring (F1) is press-fitted between the connection flange (F) and the explosion-proof valve (7) for preventing the leakage of combustible gas.

7. The water resistance safety device for use on a combustible gas pipeline according to claim 6, characterized in that: The explosion-proof valve (7) is composed of a mounting flange (71), an upper flange (72), a flame arrester (73), a sealing cylinder (74), a sealing cover (75) and a small pressure spring (76); the flame arrester (73) is pressed between the mounting flange (71) and the upper flange (72) through a bolt assembly (77); the sealing cylinder (74) is fixedly installed in the center hole formed by the upper flange (72); the sealing cover (75) and the sealing cylinder (74) are slidably matched up and down, and the sealing cover (75) and the sealing cylinder (74) are sealed to form an air pressure balance chamber (Q), and the small pressure spring (76) is arranged in the air pressure balance chamber (Q), the upper end of the small pressure spring (76) is connected to the sealing cylinder (74), and the lower end of the small pressure spring (76) is connected to the bottom plate of the sealing cover (75).

8. The water resistance safety device for use on a combustible gas pipeline according to claim 7, characterized in that: An explosion-proof valve port (71a) is formed at the center of the mounting flange (71), and the explosion-proof valve port (71a) is connected to the gas storage chamber (12b) of the inner tank (12) through the inner pipe (G2) of the explosion-proof interface (5); the flame arrester (73) is annular, and a pressure relief zone (X) is formed between the outer peripheral surface of the sealing cover (75) and the flame arrester (73), and the pressure relief zone (X) is connected to the outside atmosphere through the flame arrester (73); the bottom plate of the sealing cover (75) is sealed with the explosion-proof valve port (71a) to form a throat for controlling the gas storage chamber (12b) to communicate with the pressure relief zone (X), and a pressure balance hole (75a) is opened at the center of the bottom plate of the sealing cover (75) for connecting the pressure balance cavity (Q) with the gas storage chamber (12b).

9. The water resistance safety device for use on a combustible gas pipeline according to claim 8, characterized in that: The explosion-proof valve port (71a) on the mounting flange (71) is provided with a valve port sealing ring (78) for improving the sealing performance of the throat port. A plurality of air guide grooves (75b) are longitudinally processed on the outer peripheral surface of the sealing cover (75). The air guide grooves (75b) are used to communicate the air pressure balance chamber (Q) with the pressure relief area (X) after the sealing cover (75) moves upward a certain distance.

10. The water resistance safety device for use on a combustible gas pipeline according to claim 9, characterized in that: A large cylindrical inner wall (741) and a small cylindrical inner wall (742) are formed in the cylinder cavity of the sealing cylinder (74), and the diameter of the large cylindrical inner wall (741) is larger than the diameter of the small cylindrical inner wall (742); a small sealing ring (M) for sealingly cooperating with the small cylindrical inner wall (742) is installed on the outer peripheral surface of the upper end of the sealing cover (75).

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